gomonkey is a library to make monkey patching in unit tests easy, and the core idea of monkey patching comes from Bouke, you can read this blogpost for an explanation on how it works.

• support a patch for a function
• support a patch for a public member method
• support a patch for a private member method
• support a patch for a interface
• support a patch for a function variable
• support a patch for a global variable
• support patches of a specified sequence for a function
• support patches of a specified sequence for a member method
• support patches of a specified sequence for a interface
• support patches of a specified sequence for a function variable

• gomonkey fails to patch a function or a member method if inlining is enabled, please running your tests with inlining disabled by adding the command line argument that is -gcflags=-l(below go1.10) or -gcflags=all=-l(go1.10 and above).
• A panic may happen when a goroutine is patching a function or a member method that is visited by another goroutine at the same time. That is to say, gomonkey is not threadsafe.

• ARCH

  • amd64
  • arm64
  • 386
  • loong64

• OS

  • Linux
  • MAC OS X
  • Windows

• below v2.1.0, for example v2.0.2

$ go get github.com/agiledragon/gomonkey@v2.0.2

• v2.1.0 and above, for example v2.2.0

$ go get github.com/agiledragon/gomonkey/v2@v2.2.0

$ cd test 
$ go test -gcflags=all=-l

Please refer to the test cases as idioms, very complete and detailed.